Futures 3/4 inch white box filler
Futures Box Fillers eliminate the holes left behind when you're not using all your Fin boxes. Ie: tri fin set in a mal Using Box Fillers will reduce drag and make your board livelier and perform better. This lessens drag from empty fin boxes for 3/4" 'F' box.
If you have a tri fin mal set up and want to use as a single fin use 2 ¾ inch fillers in the side boxes
The price is per filler.